Browse Prior Art Database

Universal Four Point Locator

IP.com Disclosure Number: IPCOM000081973D
Original Publication Date: 1974-Sep-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Cochran, TJ: AUTHOR [+3]

Abstract

Four-point locators are used to accurately position parts. As in Fig. 1 locator fingers 1 move through slide slots 2 on a cover plate 3, in order to grasp the corners of the part from opposite sides. A cam 4 located in its housing 5 actuates the movement of the locator fingers 1.

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Universal Four Point Locator

Four-point locators are used to accurately position parts.

As in Fig. 1 locator fingers 1 move through slide slots 2 on a cover plate 3, in order to grasp the corners of the part from opposite sides. A cam 4 located in its housing 5 actuates the movement of the locator fingers 1.

This design differs from conventional ones in that two extra slots 6 are provided, so that locator fingers 1 can grasp the part from another direction. This improvement is useful in semiconductor module manufacture. If a substrate is inverted so that it may undergo processing on its bottom as well as its top surface, the corners by which the wafer is grasped may be reversed. Fig. 2. By moving the locator fingers to the other slots and rotating the cam 4 and cam housing 5 90 degrees to actuate the locator fingers 1 through these other slots 6, the same corners can be grasped after the part has been inverted. This enables the part to be accurately positioned whichever side is facing up; duplicate hardware is not required for this result.

Another feature of this design is its flexibility for use with a number of part sizes. Extenders for the finger locators may be used so that the locator may accommodate a number of part sizes.

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